Need help planning for July trip

I am going from Vegas to the seki area and than south of la on the coast.

Dates are mid July and I am wondering where to stay. The only thing that might be hard for me is the temps , so would really rather something with air.

Kinda open and see the Muir Lodge is full with only the tents available.

Guessing I would do a 4-7 mile hike during the day and mainly tourist things .

Any options you can think of would be awesome 👍